Vanadium-containing impact-tool for hot work



PERCY A. E.

ARMSTRONG, OF LOUDONVILLE, NEW YORK, ASSIGN OR TO LUDLUM STEEL COMPANY, A CORPORATION OF NEW JERSEY.

- VANADIUM CONTAINING IMPACT-TOOL FOR HOT WORK.

No Drawing.

To aZZwho mitmay concern.

Be it known that I, PERCY A. E. ARM srrRoNe,..a subject of the King of Great Britain, and a resident of Iioudonville, county of Albany, State of New York, have invented certain new and useful Improvements. in Vanadium-Containing Impact-. Tools for Hot Work, of which the followlng' In making impact tools for hot work, such as above referred to, having a composition within the following range :carbon about 30-50%, manganese about .301%, chromium about 1.01.75%, nickel about 35-50%, the; remainder iron, with small proportions of impurities present in steel, as silicon, sulfur, phosphorus, copper, etc., I have found that. such steel is air hardening and is well adapted for such tools as drop forging dies and the like, where they are not very large, or where the impact stresses are not unduly great, or the reversals of stress are not frequent. For such work, impact tools containing vanadium are preferable, but I have found thatwhen tools are made of alloy steel within the range of composition above referred to, and vanadium is included therewith, without other change than the inclusion of vanadium, the material, which has good air hardening qualities prior to inclusion of vanadium therewith no longer has such excellent air hardening qualities, and is not -so well adapted for tools for the purposes referred to, as is the case with material having better air hardening qualities.

I have found that vanadium may be included to advantage and an alloy steel obtained, which is stronger dynamically and better adapted to' stand up under heavy impact work on hot metal as in drop forging,

' for example, if the proportion of nickel is increased, while the chromium content. is kept about as before, or, if, keeping the nickel about as before, the chromium content is increased, or if the increase is distributed between the nickel and chromium in about the relative proportion given below.

A typical illustrative example falling within the composition range first above re- Specification of Letters Patent. Patented A g, 23, 1921, Application filed April 10, 1919. Serial No. 289,150.

ferredto contains carbon about 35%, chromium about 1.25%. and nickel about 4.7 5%, the rest iron, with small proportions of impurities such as already referred to.

If impact tools such as described are made of this composition, and vanadium included therewith to the extent of about .25%, which is a desirable proportion, it" will be found that they have no longer such excellent air hardening qualities. I have found that, in order that they shall have desirably good air hardening qualities and be well adapted for the work" to which they are to be put, satisfactory results mav be obtained by increasing the nickel to about 56%, or the chromium to about 2%, or the increase may be distributed between the nickel and the chromium in about the same relative proportion for each.

The following examples are typical of composition for vanadium containing impact tools of the class described, but it is to be understood that these examples are given for illustration and for affording a clear understanding of my invention only, and not for limitation of the invention, as there may be more or'less variation away from the precise figures given and, as already stated, the increase may be distributed between the nickel and the chromium, if desired. The percentages given are by weight Example 1..

Carbon about .35% Manganese about" .40% Chromium about 1.25% Nickel about 6.0 Vanadium about .25%

The rest iron with small proportions of impurities as above.

The rest iron with small proportion of impurities as above.

Impact tools for hot work, made of materials such as described, have excellent air hardening qualities, and withstand great impact stresses, standing up well in heavy work, such as making large drop forgmgs or other heavy impact Work on hot metal, or Where ening alloy steel, consisting substantially of:

the stress reversals are frequent. carbon about .35%, manganese about 40%, I claim: chromium about 1.25%, nickel about 6%, 1. Impact tools for hot Work of air hardvanadium about 25%, and the greater part 5 ening alloy steel, containing: carbon about of the remainder iron. 15

.80-.60%, manganese about .301;%, chro-' In testimony that I claim the foregoing I mium about 11.75%,nicke1 about 56%, hereto set my hand, this 7th day of April, and also containing vanadium and the 1919. greater part of the remainder iron.

10 2. Impact tools for hot Work of air hard- PERCY A. E. ARMSTRONG. 

